The principle of pneumatic brake is to push the piston to make the linear motion by inputting the pressure gas into the air bag of the pneumatic brake, and the friction block of the brake is reached to press the brake wheel to produce the friction and braking function.

Pneumatic brakes by air pressure to connect, rely on the return spring to release, the disc by air pressure along the axis of sliding, contact friction plate, disc, friction plate, etc., was assembled into the hub, become an integrated structure, friction plate can be opened to adjust the way the nut to decompose, exchange simple.